Network, generic

U01BF Lost Communication With Battery Management Control Module

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modePossible

A battery management control module watches cell voltages, temperatures and current and decides how much power a pack may deliver or accept. The J2012 name does not tie it to the high-voltage battery. GM's 2024 and 2025 tables (24OBDG07, 25OBDG03B) assign U01BF00 to the central gateway module, which sets it when supervised messages from a unit GM calls LIBI are missing for 2.5 times their nominal period, with supply above 7 V and an active power mode; the fault matures after 6.5 s and is Type B, two trips. No other manufacturer documents the code publicly. Depending on what the module guards, expect battery or electrical warnings and limited charging or power. U04C0 is the invalid-data partner, U0111 the battery energy control module A, U01B0 the 12 V battery sensor.

Likely causes

Bus wiring or connector between gateway and battery module damaged
Module supply interrupted or 12 V voltage too low
Battery management control module faulty

Symptoms

  • Battery or electrical system warning
  • Charging or drive power limited
  • MIL on (GM Type B)

Repair estimate

DifficultyHardWorkshop job
Parts and labour€0–2,500
Time0.5–4 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

bmscan bus

Related codes

U04C0U0111U01B0U0412

References: gsi.ext.gm.com, gsi.ext.gm.com, en.wikipedia.org.